Controlling means for electric motors.



N0. 838,021. PATENTED DEC. 11, 1906. F. D. HALLOOK.

CONTROLLING MEANS FOR ELECTRIC MOTORS.

APPLICATION FILED JUNE 2.1905. RENEWED JAN. 20, 1806.

2 SHEETS-SHEET l.

gr QZ1L%%W A iTORNEY PATENTED DEC. 11, 1906. F. 1). HALLOGK. CONTROLLINGMEANS FOR ELECTRIC MOTORS. APPLIOATION FILED JUNE 2.1905. RENEWED JAN.20, 1906.

2 SHEETSSHEET 2.

INVENTOR BY I AiTORNEY WITNESSES:

%FH W @EIATES rarnnr oration FLETCHER D. HALLOCK, )F WTLKINSBURG,PENNSYLVANiA, ASSIGNUR TU W ESTHJGHOUSE ELECTRlC & MANUFAU URTNGCOMPANY, A Clt- PURATION OF PENNSYLVANIA.

CQNTRQLLENG MEANS FQR ELEQTREG WEQTQRSD No. ssaoai.

Specification of Letters Patent.

Patented Dec. 11. 19cc.

Application filed June 2, 1906. Renewed January 20. 1906. Serial No.297,042.

legheny and. State of Pennsylvania, have invented a new and usefulImprovement in Controlling Means for Electric Motors, of which thefollowing is a specification.

My invention relates to controlling means I for dynamo-electricmachinery, and particularly to means that are adapted to efiectrelatively wide motor speed variations in either direction of rotationby a combined reversingldrum and a field-resistance regulator.

he object of my invention is to provide means'for adjusting the amountof resistance included in the field-circuit of a motor without changingthe predetermined arc of rotation or the normal action of a singlecontrolling-handle by which a movable contact-arm of the fieldresistance and the switchingdrum are simultaneously actuated.

Controllers heretofore employed for governing electric motors that wereutilized for .driving machine-tools or for similar purposes rmauiringwide speed variations usually embo ied a reversing and switching drum towhich a contact-arm was rigidly attached to engage a plurality offield-rheostat contacts as the drum was driven through a predeterminedarc of rotation by an operating-handle or other equivalent means. Withthis arrangement it was necessary to reconnect the resistance or replaceit ehtirely in order to effect any adjustment of the field resistance tosuit special conditions'or to adapt the controller to any size of motorother than that for which it was designed.

In order to-make a more flexible arrangement which shall obviate theaforesaid objections and limitations, I have devised a controller havinga field-rheostat the contact-arc of the stationary member'of which isgreater than that of the drum rotation and one of the contact members ofwhich is so adjustable upon its support that the maximum amount ofresistance included in the field-circuit may be varied to suit any givencase.

In the accompanying drawings, Figure 1 is a side elevation, with thecase partially removed, of a controller constructed in accordance withmy invention. Fig. 2 is a detail view of one of the controller parts.Fig. 3 is a transverse sectional view of the controller, and Fig. 4 is adiagrammatic view of an electric-motor-control system embodying my invention.

Referring first particularly to Fig. 4, an electric motor 1 is suppliedwith energy from a line 2 3 through a controller 4 and is provided witha shunt field-magnet winding 5, that may be regulated by a variableresistance 6. The fingers of the controller 4 ena, b, c, d, e,f, g, h,i, 3', is, Z, and m when the drum is rotated in one direction and in aplura'lity of similar positions 7", s, t, u, 'u, w, and a: when the drumis rotated in the opposite direction. The variable resistance 6 isprovided with a plurality of taps that lead tostationary"contact-terminals 7 to 39, inclusive, which areisuccessivelyen aged by an adjustable contact-arm 41, wit which the controller-drumis provided, When the controller-fingers engage the drum in the offposition 2, the contact-arm 41 enga es the old-resistance contact 20,and as the rum is moved so that the fingers occupy position a, which isthe starting'position for forward rotationwf the 'motor 1 the arm 41 enages successively the contacts 21, 22, an 23. When the fingers occupyposition a, energy is supplied. from the positive line-terminal 3through a conductor 42, contactdinger 43, contact-ring segments 44and45, finger 46, conductor 47 to one armature-terminal 48 of themotor 1. From the other armatureterminal 49 of the motor 1 the circuitis completed through a conductor 50, contact-finger 51 contact-ringsegments 52 and 53, finger 54, resistance 55, finger 56, and conductor57 to the negative line-terminal 2. The ring-segment is also connectedto the contact-arm 41, which is in engagement with the field-resistancecontact-terminal 23, so that the cirportion of the resistance 6, the conuctor 58, and the field-magnet winding 5to the negative line-terminal 2.Thus when the controller is in this position the resistance is connectedin series with the armature-circuit, and the small portion of theresistancefi is connected in series with the field magnet winding 5, sothat the motor 1 may be started mature-currents.

gage the drum 4 in a plurality of positions.

cuit is completed by this path throu" h a small with a strong field andwithout excessive ar- 1o 5 As the controller-drum 1s 7 inclusive, themotor connections remain the same, and the contact-arm 4 1 successivelyengages contacts 28 to 37, inclusive, thereby l to engage'the fingers inpositions .9 and t, the.

gradually introducing the resistance 6 into the field-circuit of themotor, which weakens the field and increases the speed of the motor.

When the controller-fingers occupy the last position m, if the speed ofthe .motor is still row the arm 41 may be so adjusted as to cut in agreater amount of the resistance 6 as the drum'moves to engage thefingers from ositron z to position m,,or if'the speed is too high thearm 41 ,may be, adjusted in the opposite d rection, so as .to cut a lessamount of resistance... For example, the arm may be so adi'usted as toengage the contact-termina s 22' to 39 oi it ma be so adjusted as toengage the termin 18 to-35. When the controller-fingers occupy theposition r, which corresponds to the position a, the resistance .55 isincluded in the armature-circuit as before; but the direction of currentthrough the armature is reversed, energy be ing supplied from the finger43, through ring- 'segments 60 and61, toarmature-terminal 49 and fromarmatureterminal 48, through conductor 47, finger 62, contact-ringsegments 63, 64, and 65., finger 54, resistance 55, finger 5.6,andconductor 57, to the negative line-termine 2. When thecontroller-drummoves resistance 55' is first short-circuited and thenout out,and as the positions 8, t, u, v, w, and a: are occupied thecontact-arm 41 engages contacts 16 to 7', which are connected to thecontacts 24 to 32-, and consequently introduces portions of theresistance 6, as before. The contacts 16, 17, 18, 19, 20, 21, 22', 23,and 24, which are engaged bythe contactarm 41, while the controller-drummoves to en gage the fingers from the off position to the position a orthe position 7', are connected together, so that the "resistance 6 isgradually introduced into the field-circuit regardless of the adjustmentof the arm 41 As shown in'Figs. 1, 2', and S, the controllerdrum 4 isactuated by an o crating-handle 66 in the usual manner, an adjustablyattached to its lower end, by means of a ring shaped body portion 67,which movably engages a corrcs )onding cylindrical portion 68 on thecontrolier-drum, the radial contactarm 41,the ring portion 67 of thecontact member being clamped to the portion 68 by means of set-screws69. The contact-terminals 7 to 39 are mounted upon an insulating-plate70, which is rigidly fixed in a plane substantially perpendicular to theaxis of rotation of the drum and are annularly disposed thereon, so thatthey may be enga ed by the contactarm 41 as the control er-drum isrotated.

Each contact-terminal is'provided with setcontrollers however varied asto size, form,

and arrangement of parts, in which either of two cooperating contactmembers is adjust able upon its support along the path of movement ofthe movable member in such manner and to such degree that thehereinbeforespecified result may be secured.

I claim as my invention- 1. in a controller fordynamo-eiectric-machinery, the combination with a rotatable,contact-carrying drum and a stationary contact-carrying platesubstantial perpendicular thereto, of a circumferentially-adjustable,radially-dis osed contact-armv that is mounted upon said drum to engagethe contacts on said plate.

2. In a controller for an electric motor, the combination with arotatable, contact-carrying drum that is limited to a predetermined areof rotation and is provided with a circumierentially-adjustablecontact-arm, of a l-urality of fixed contact-terminals that may heengaged by saidcontact-arm.

3. The combination with a plurality of fixed contact-terminals, ot' acontact-arm that is rotatably mounted and limited to a predetermined arcof rotation andis radial ICC fixed; contact-terminals that are in aplane which is substantially perpendicular to the axis of said drum, ofa radially-disposed coutact-arm mounted on said drum which angages saidiixed contact-terminals and is 011'- cumferentially adjustable u on thedrum.

5. The combination witn a plurality at fixed contactterminals arrangedsubstantially in an arc of a circle, of a rotatablyeeaear mountedcontact-arm which may engage said contact-ternnnals through apredetermined arc of rotation and 1s circumferentially adjustable inrespect to said contacts.

adjustably mounted on said rotatable mem* her. I

7. in a controller for dynamo-electric machinery, the combination with arotatable, contact-carrying drum that is limited to a predetermined arcof rotationyand a fieldrheostat adjacent to one end thereof, of acontact-arm that is carriedby said drum to engage a plurality ofcontact-terminals on said rheostat and is circumferentially adjustablein respect to said drum.

8. The combination with a rotatable switch-drum and a plurality offixed, engaging contact-fingers therefor, of an adjustable andradially-mounted contact-arm, and a plurality of contact-terminalslocated substantially in the arc of a circle and in the plane ofrotation of the contact-arm.

9. The combination with an electric motor and a switching andcontrolling drum therefor, of a field-resistance'regulating device thatcomprises an adjustably and radially mounted contactrarm and a pluralityof con tact-terminals located substantially in the arc of a circle inthe plane of rotation of the contact-arm.

10. In a controller, the combination with a ro tatably mounted contactcarrying member that is limited to a predetermined arc of rotation, aresistance, and a plurality of fixed contact-terminals for saidresistance mounted in the arc of a circle one plane substantiallyperpendicular to the laxis oi the rotatable member, of a radialcontact-arm which is adjustably mounted on the said contactcarryingmember and engages said fixed contact-terminals.

11. in a control system, the combination with an electric motor, aswitching and reversing controller therefor and a field resistance thatis provided with a plurality of steps for use therewith, of means forregulat ing the amount of resistance included in the field-circuit atany. predetermined point in the controller operation.

12. in a control system, the combination with an electric motor, aswitching and reversing controller and a field resistance for usetherewith, of a contact-arm that is adjustably mounted on thecontroller-drum and is actuated therewith to increase the resistance inthe field-circuit as the controller successively occupies a plurality oipredeten mined positions.

ill. in a controller for electric motors, the combination with a set ofcontact-fingers and at cooperating movable member, of a subdividedresistance having a set of contactterminals and a contact-arm that ismounted upon said movable member and is adjustable thereon.

14. in a controller, the combination with a set of contact-fingers and acooperating movable member, of a rheostat comprising a resistance-body,a set of contactterminals connected to different points, therein, and acontact-arm that is adjustably mounted on said movable member. I v

15. in a controller for dynamo-electric machinery, the combination witha movable, contact-carrying member and aset of cooperating fingers, of aplurality of stationary contact-terminals and a contact-arm that isadjustably mounted on said movable mem her to engage the fixedcontact-terminals.

16. In a controller for electric motors, the combination with arotatable contact-carrying drum that is limited to a predetermined arcof rotation and is provided with a contact-arm, or a normally stationarycontact member comprising a-plurality of contactterminals in position tobe engaged by said contact-arm and means for adjusting one or saidcontact members upon its support relatively to the other.

17. The combination with a rotatable contact-carrying drum that islimited to a predetermined arc of rotation, "and a contact membercomprising a plurality of contactterminals that are in a plane which issubstantially perpendicular to the axis of said drum, of aradially-disposed contact-arm mounted on said drum to engage said con-'tact-terminals, and means for rotatively adjusting one of said membersupon its support with reference to the other.

18. in a controller for dynamo-electric machines, the combination. witha rotatable contact-carrying drum that is limited to a predetermined arcof rotation, a rheostat and a normally stationary contact membercomprising a set off contactterminals disposed adjacent to one end ofsaid drum, of a contact member that is carried by said drum to engagesaid contact-terminals, and means for adjusting one of said contactmembers upon its support with reference to the other.

19. The combination with a rotatable switch-drum and a plurality ofstationary contact-fingers to engage therewith, of a contact-armsupported by said drum, a normally stationary contact member comprisinga plurality. of contact-terminals that are disposed substantially in thearc of a circle and in the plane of rotation of the contact-arm,

and means for adjusting one at said contest at circle in the plane ofrotation of the conmemibers upon its support in the cents/ctpath.

20 The combination with sit electric m0- toz and a switching andcontrolling drum therefor, of e field-resistsnceereguieting de vice thatcomprises reclisllymmumted CUR tact-arm and s normally stationeryeentsct member comprising a plurality of contactterminsls disposedsubstantially in the are 0f test-arm, and means for rotetively adjustingone of the contact members upon its support with reference to the other.

In testimony whereof I have hereunto subscribed my name this 31st day ofMay, 1905.

FLETCHER D. HELLLOCK. Witnesses J. W. HARRIS, BIRNEY Hume.

